Hello List, we have the following scenario with innovaphone PBX (could be any other PBX): - In the PBX there are users configured - Native innovaphones register with the PBX via SIP as some of these users (one user per phone) - FreeSWITCH is used as a call controller for other of these users, and registers for them with the PBX (via user gateways), when the user registers with FreeSWITCH from its SoftPhone I want to use the native hold/unhold of that PBX. Therefor I used WireShark to to find that the native phones send an INVITE to the PBX, for the party to go on hold, with media attribute inactive. Now, if I have a call between a FreeSWITCH user and a native phone, how can I make FreeSWITCH to make the PBX put the phone on hold? Somehow send that INVITE by command or any other methods. Thank you.